Manual cherry-pick of PR: Adjusting test_stress_arp is it can handle cases of ipv6-only topologies . sonic-net#20932 (sonic-net#923)

Manual cherry-pick of PR
sonic-net#20932

Adjusting test_stress_arp is it can handle cases of ipv6-only topologies
.

Author: gshemesh2

tests/arp/arp_utils.py

@@ -10,11 +10,12 @@
 BASE_MAC_PREFIX = "00:00:01"
 
 
-def clear_dut_arp_cache(duthost, ns_option=None):
+def clear_dut_arp_cache(duthost, ns_option=None, is_ipv6=False):
     logger.info("Clearing {} neighbor table".format(duthost.hostname))
-    arp_flush_cmd = "ip -stats neigh flush all"
+    ipv6_cmd = '-6' if is_ipv6 else ''
+    arp_flush_cmd = "ip {} -stats neigh flush all".format(ipv6_cmd)
     if ns_option:
-        arp_flush_cmd = "ip -stats {} neigh flush all".format(ns_option)
+        arp_flush_cmd = "ip {} -stats {} neigh flush all".format(ipv6_cmd, ns_option)
     duthost.shell(arp_flush_cmd)
 
 

tests/arp/test_stress_arp.py

@@ -9,7 +9,7 @@
 from scapy.all import Ether, IPv6, ICMPv6ND_NS, ICMPv6NDOptSrcLLAddr, in6_getnsmac, \
                       in6_getnsma, inet_pton, inet_ntop, socket
 from ipaddress import ip_address, ip_network
-from tests.common.utilities import wait_until, increment_ipv6_addr
+from tests.common.utilities import wait_until, increment_ipv6_addr, is_ipv6_only_topology
 from tests.common.errors import RunAnsibleModuleFail
 
 
@@ -22,7 +22,8 @@
 logger = logging.getLogger(__name__)
 
 pytestmark = [
-    pytest.mark.topology('t0')
+    pytest.mark.topology('t0'),
+    pytest.mark.dualtor_active_standby_toggle_to_enum_tor
 ]
 
 LOOP_TIMES_LEVEL_MAP = {
@@ -35,9 +36,11 @@
 
 
 @pytest.fixture(autouse=True)
-def arp_cache_fdb_cleanup(duthost):
+def arp_cache_fdb_cleanup(duthosts, rand_one_dut_hostname, tbinfo):
+    is_ipv6_only = is_ipv6_only_topology(tbinfo)
+    duthost = duthosts[rand_one_dut_hostname]
     try:
-        clear_dut_arp_cache(duthost)
+        clear_dut_arp_cache(duthost, is_ipv6=is_ipv6_only)
         fdb_cleanup(duthost)
     except RunAnsibleModuleFail as e:
         if 'Failed to send flush request: No such file or directory' in str(e):
@@ -51,8 +54,10 @@ def arp_cache_fdb_cleanup(duthost):
 
     # Ensure clean test environment even after failing
     try:
-        clear_dut_arp_cache(duthost)
-        fdb_cleanup(duthost)
+        dut_list = duthosts if "dualtor-aa" in tbinfo["topo"]["name"] else [duthost]
+        for dut in dut_list:
+            clear_dut_arp_cache(dut, is_ipv6=is_ipv6_only)
+            fdb_cleanup(dut)
     except RunAnsibleModuleFail as e:
         if 'Failed to send flush request: No such file or directory' in str(e):
             logger.warning("Failed to clear arp cache or cleanup fdb table, file may not exist yet")
@@ -90,13 +95,15 @@ def genrate_ipv4_ip():
     return list(ptf_intf_ipv4_hosts)
 
 
-def test_ipv4_arp(duthost, garp_enabled, ip_and_intf_info, intfs_for_test,
+def test_ipv4_arp(duthosts, enum_rand_one_per_hwsku_frontend_hostname,
+                  garp_enabled, ip_and_intf_info, intfs_for_test,
                   ptfadapter, get_function_completeness_level):
     """
     Send gratuitous ARP (GARP) packet sfrom the PTF to the DUT
 
     The DUT should learn the (previously unseen) ARP info from the packet
     """
+    duthost = duthosts[enum_rand_one_per_hwsku_frontend_hostname]
     normalized_level = get_function_completeness_level
     if normalized_level is None:
         normalized_level = "debug"
@@ -106,6 +113,11 @@ def test_ipv4_arp(duthost, garp_enabled, ip_and_intf_info, intfs_for_test,
     pytest_assert(ipv4_available > 0 and fdb_available > 0, "Entries have been filled")
 
     arp_available = min(min(ipv4_available, fdb_available), ENTRIES_NUMBERS)
+    # Limit ARP scale based on available NH entries
+    asic_type = duthost.facts["asic_type"]
+    if 'cisco-8000' in asic_type:
+        ipv4_nh_available = get_crm_resources(duthost, "ipv4_nexthop", "available")
+        arp_available = min(arp_available, ipv4_nh_available)
 
     pytest_require(garp_enabled, 'Gratuitous ARP not enabled for this device')
     ptf_intf_ipv4_hosts = genrate_ipv4_ip()
@@ -181,8 +193,11 @@ def add_nd(ptfadapter, ip_and_intf_info, ptf_intf_index, nd_available):
     logger.info("Sending {} ipv6 neighbor entries".format(nd_available))
 
 
-def test_ipv6_nd(duthost, ptfhost, config_facts, tbinfo, ip_and_intf_info,
+def test_ipv6_nd(duthosts, enum_rand_one_per_hwsku_frontend_hostname,
+                 ptfhost, config_facts, tbinfo, ip_and_intf_info,
                  ptfadapter, get_function_completeness_level, proxy_arp_enabled):
+    duthost = duthosts[enum_rand_one_per_hwsku_frontend_hostname]
+    is_ipv6_only = is_ipv6_only_topology(tbinfo)
     _, _, ptf_intf_ipv6_addr, _, ptf_intf_index = ip_and_intf_info
     ptf_intf_ipv6_addr = increment_ipv6_addr(ptf_intf_ipv6_addr)
     pytest_require(proxy_arp_enabled, 'Proxy ARP not enabled for all VLANs')
@@ -198,7 +213,10 @@ def test_ipv6_nd(duthost, ptfhost, config_facts, tbinfo, ip_and_intf_info,
     pytest_assert(ipv6_available > 0 and fdb_available > 0, "Entries have been filled")
 
     nd_available = min(min(ipv6_available, fdb_available), ENTRIES_NUMBERS)
-
+    asic_type = duthost.facts["asic_type"]
+    if 'cisco-8000' in asic_type:
+        ipv6_nh_available = get_crm_resources(duthost, "ipv6_nexthop", "available")
+        nd_available = min(nd_available, ipv6_nh_available)
     while loop_times > 0:
         loop_times -= 1
         try:
@@ -213,7 +231,7 @@ def test_ipv6_nd(duthost, ptfhost, config_facts, tbinfo, ip_and_intf_info,
                               "Neighbor Table Add failed")
         finally:
             try:
-                clear_dut_arp_cache(duthost)
+                clear_dut_arp_cache(duthost, is_ipv6=is_ipv6_only)
                 fdb_cleanup(duthost)
             except RunAnsibleModuleFail as e:
                 if 'Failed to send flush request: No such file or directory' in str(e):
@@ -246,6 +264,7 @@ def test_ipv6_nd_incomplete(duthost, ptfhost, config_facts, tbinfo, ip_and_intf_
                             ptfadapter, get_function_completeness_level, proxy_arp_enabled):
     _, _, ptf_intf_ipv6_addr, _, ptf_intf_index = ip_and_intf_info
     ptf_intf_ipv6_addr = increment_ipv6_addr(ptf_intf_ipv6_addr)
+    is_ipv6_only = is_ipv6_only_topology(tbinfo)
     pytest_require(proxy_arp_enabled, 'Proxy ARP not enabled for all VLANs')
     pytest_require(ptf_intf_ipv6_addr is not None, 'No IPv6 VLAN address configured on device')
 
@@ -272,7 +291,7 @@ def test_ipv6_nd_incomplete(duthost, ptfhost, config_facts, tbinfo, ip_and_intf_
     logger.info("original nf_conntrack_icmpv6_timeout: {}".format(orig_conntrack_icmpv6_timeout))
 
     try:
-        clear_dut_arp_cache(duthost)
+        clear_dut_arp_cache(duthost, is_ipv6=is_ipv6_only)
 
         duthost.command("conntrack -F")
 
@@ -286,7 +305,7 @@ def test_ipv6_nd_incomplete(duthost, ptfhost, config_facts, tbinfo, ip_and_intf_
         conntrack_cnt_post = int(duthost.command("cat /proc/sys/net/netfilter/nf_conntrack_count")["stdout"])
         logger.info("nf_conntrack_count post test: {}".format(conntrack_cnt_post))
 
-        pytest_assert((conntrack_cnt_post - conntrack_cnt_pre) < tgt_conntrack_cnt * 0.1,
+        pytest_assert((conntrack_cnt_post - conntrack_cnt_pre) < tgt_conntrack_cnt,
                       "{} echo requests cause large increase in conntrack entries".format(tgt_conntrack_cnt))
 
         pytest_assert("[UNREPLIED]" not in duthost.command("conntrack -f ipv6 -L dying")["stdout"],
@@ -302,4 +321,4 @@ def test_ipv6_nd_incomplete(duthost, ptfhost, config_facts, tbinfo, ip_and_intf_
 
         duthost.command("conntrack -F")
 
-        clear_dut_arp_cache(duthost)
+        clear_dut_arp_cache(duthost, is_ipv6=is_ipv6_only)